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SH 28 pull start engine is made from high quality materials and designed for long-lasting performance. And is engineered for superior torque and durability allowing you to unleash the full potential of your 1/8 nitro car. Specifications: Model: M28-P3 Displacement: 4.57cc Speed: 28000rpm Power: 3.6hp Piston diameter: 18.5mm Piston stroke: 17mm Exhaust position: rear Weight: 433g Suit for: 1/8 nitro powered RC car Package Information: Package size: 13 * 12.5 * 7.5cm / 5.1 * 5 * 3in Package weight: 511g / 1.13lb White box package Package List: 1 * SH M28-P3 4.57cc Engine FAQ of the Engine: 1.The engine fails to start Replace the glow plug or charge the battery. Clean or replace the clogged part. Remove the glow plug and discharge fuel. Set the idle adjusting screw to the original position. Set the servo to neutral then re-adjust it. 2.The engine can start but stall immediately. Clean or replace the clogged part. Re-adjust idle adjusting screw and needle valve/low-end mixture screw. Allow the engine to thoroughly cool down and turn the needle valve open at the angle of 30 degrees. 3.Poor reaction response on the engine Re-adjust needle valve/low-end mixture screw. Install the pressure line from the muffler to the fuel tank correctly. 4.The vehicle becomes difficult to control Replace or charge the batteries. Extend the transmitter antenna fully to obtain better receptions. Set the servo to neutral then re-adjust it.